diff --git a/create_sample_data.py b/create_sample_data.py
index 9bc6363..57fa04a 100644
--- a/create_sample_data.py
+++ b/create_sample_data.py
@@ -13,16 +13,19 @@ def create_sample_sales_data():
     months = ['1월', '2월', '3월']
 
     for month in months:
+        # 랜덤 행 수 결정
+        num_rows = random.randint(25, 30)
+
         # 랜덤 데이터 생성
         data = {
-            '날짜': [datetime(2025, months.index(month)+1, day)
-                    for day in range(1, random.randint(25, 31))],
+            '날짜': [datetime(2025, months.index(month)+1, random.randint(1, 28))
+                    for _ in range(num_rows)],
             '제품명': [f'제품{random.randint(1,10)}'
-                      for _ in range(random.randint(25, 30))],
+                      for _ in range(num_rows)],
             '수량': [random.randint(1, 100)
-                    for _ in range(random.randint(25, 30))],
+                    for _ in range(num_rows)],
             '단가': [random.randint(1000, 50000)
-                    for _ in range(random.randint(25, 30))],
+                    for _ in range(num_rows)],
         }
 
         # 매출액 계산